We've all heard the horrifying stories about children being targeted by online predators.

It's a parent's worst nightmare that their child suffers at the hands of a stranger masquerading as a friend.

Ahead of the News'Facebook Live with child protection charity NSPCC and mobile phone giant O2 on Wednesday, July 19, which will look at how to keep children safe online, we asked what are the most potentially dangerous apps for youngsters?

Controversy has dogged snapchat's new 'snapmap' feature that allows followers to see where a person is at any time, unless they have ghost mode on. For this reason it's on the list.

Also on the NSPCC's list of 39 dangerous apps are Yellow and Musical.ly, alongside well-known sites like Facebook, Instagram and Twitter.

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Sarah Lambley, the NSPCC's community fundraising manager for Cambridge, said: "Recent media attention has been given to some social media apps that children and young people are using, such as Yellow, Musical.ly and Snapchat’s new Snapmap feature.

"Apps that allow strangers to share photos with children are deeply troubling – particularly where the images being exchanged are of a sexual nature. "

Musical.ly also lets users create, share and find short videos.

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A full list of the 39 apps can be found on Net Aware , which has been set up by the NSPCC and 02 to give parents up-to-date information on the ever changing technology, social media sites and apps that are most popular with youngsters.

Sarah added: "Our research clearly shows that many children do not feel that they are shielded from upsetting, dangerous and adult content.

"That’s why we are calling on the Government to legislate to ensure all under-18s are given the most stringent privacy settings automatically when they sign up to an app and for social media companies to be fined for failing to protect children.

"But it’s also vital parents know about their child’s online world and regularly talk with their children about how to get help if they need it."

Two thirds of young people in the East of England have seen inappropriate content online, according to research by the UK Safer Internet Centre.